Chuck or work holder



Sept. 7, 1948. B. o. RICHARD 2,443,738

cnucx on WORKHOLDER Filed July 9, 1945 5 Sheets-Sheet 1 I 9/9 I l2 /0 FIG 5. 6g

, INVENTQR. Bernard 0. fi/c/Iard Sept. 7, 1948. B. o. RICHARD cnucx on WORKHOLDER 5 Sheets-Sheet 2 Filed July 9, 1945 mmvron.

Bernard Q fiic/urd p 7, 1948. B. o. RICHARD cnucx 0R wofiKnoLnER 3 Sheets-Sheet 5 Filed July- 9, 1945 I N V EN TOR. v Bernord Q Ric/70rd BY v driving head by screwsandthisplatrl has.

Patented Sept. 7, p 1948 qe no tie .lie ra ,l M ht i-Aypliea tion some, 1945; seria1-No;$03,757 P This invention relates toxaohuck wliiehslseell an Oblomatioflhuekf ioratha-reason he chuck is adapted for"holdingtworlewhiahdiditifin an oblong or an elliptiealishapetinacross section.

The present invention is-intended to provide an improved chuck for doing the=zsametworbthat is done m the work holding nead omnesnmnard patent. The improvedapparatus 1 has -jgneater compactness, superior :bearing-aamngement and the cam releaseadjustmentsareralhkternalaandu.

the machine has'a roller bearing work;. 'slide. ln the apparatus of the Riohardpatent it i-s-neoessary to dismantlethe-chuek and re-adjust'athe various members in theassembly dmord e'mto get thedesiredadjustment. 1

Referring tethe -drawings:- v Fig.1 is--a longitudinal seotionoof th Fig. 2is a sectionon the lint-12 5210! Fig. 3 is aseotion on the' dine -3T3 after the slide I6 has heen raised hythe releasinge dOg 2|. I Y

Fig; 4 is a front elevation of theehuckr "Fig. 5 is a section onthe line-li-ri i I Fig. 6 is asecti'on on thezllinei ifl o Fig. 7 is a top elevatiomotth-rear-past-oithe i chuck.

Thehousingisdesignated l. 2;'is,,.the rotating driving shaft which: is i=:p1l1 1'led the 1'; driving sleeve 31 by-1pin4. Abearing ring :afltsatlghtiy on the: driving Lh8dli13,f.&l1d-f ithee-rbilemhearings;s 6 support this.bearing ringiandrotatingmeamnn the bearing ringfl, whichgis supported sin :the housing I'. .Avdrivingwplate ll is fastenedltotthe boss I 9 in the dorm oi "a; raised areuate mart-.

together for'r tetio -tosetiiera x sessthe Many tools, such-as :punehes" foremakingislots, slide "3 a the driven head which lsi 'lilfluiitdf rema ns in I the housing by means of the rolle s eta-4am zinguso. that the-driven head eannot rotate, ;:'T!his .I ilI beveXpIainedpresently. a t i :The housing-mas .holted thereto by. SCREWS-II1ZB4 segment/3.18 which cooperates with the locking 0 arrest ttheqmovement of thegdr-iven ahead he driving plateyS is provided .withnne ZfQIWaFdlyJOI' axially projectin drivingshoulder sornhoss :19: :Two radially projecting .lugss'illtare jDlfQmdedIGn;S1ide l6. .1. Pivoted on .thedri-vingihead ll) isiat releasingidog 2 l' .(Fig. 3).. :When .the.@driving zaheadwhas turned'half a turn safiter the; slidenhas sheen stoppedubytstop 22 on segment. I 82 (Fig. 22) ithedogai lxissin thJPOSifiOIlShOWHLiH Fig.3. "ifllhe ioutenend .of the dog has engaged the surface; 23 l5.iofitadjustableuoamszd. 'I his. has swung theiend of the dog inwardly androausedaitgtorengageione @df thegdrivingvshoulders.llflron thetslide l6. .mhis $118.8! shifted the slide diametrically. (Fig. '3 14:80. as

to release the lug that is locked: behind: stop 3012122? (Fig. 2). ;This has brought the opposite drivlngsho-uldersfill @up a headiof the, driving; shoulder csl 910i the. driving plate. 9. so. thatflnow; theslide; is rotated by the driving head. The slidetslidesabe- :tween the; arouate plates 25 (Fig-12) that. are

;-25S.bolted onto the; driven head by .scre'wsa26. aBhe driving; and driven .heads 1 know rotate: together :zomtherollenbearingswhich, support these jjtWO eadsz in theshousing. I

wzA work; carrying slide;2l'. is supported byzzthe oller! :bearings: 28 mounted :in retainer 2 9: in zvthe rivenwhead (Fig. 5). This work carrying slide-has .oltedithereto boltr3ll a work .hoIdingMsleeYe .r'ili ,ainawhich .mayl be. gripped 01".:10Ck8d; a mark pieeerwbytmeansx of the 2 ball chuck onpunehre- :ta-iner illrdesoribedand claimed in the .patent to :zfltls K;lRichard et a1. No;-1,621 ,811. .iThefwork carrying slide. 21. isaprovidedmith ta recess! in ,twhichiis seated the: ball bearing 1set'34 .whiohsup- .portstthe, eccentric 35. "Thisleoeentrieds.slido tabla" mounted. in the annular .flange or collar: 36

onctheend. of ithexdrivingisleeve 3:! S(Fig-; 5) Lwhioh -,-.is::fastened: to :the driving kireadby: theujambi .nut rtflsand lock nut 39. This annular flange has a dlametrio dovetail slot. 143 (Fig. fil inswhich :the

$5.586G8lkt1i6 35 (Fig. 1 1 iscadapted to travel.

" lilheinner end of theeccentrict35 is provided it with an angular :head 40 ..against whiohsbearrthe 'ohamieredends of the adjusting rodsifluandmfl. These rodsiare. adjusted longitudinally bymeans pozqof .;.a;; micrometer set of adjusting sleeves. which The external thread is twenty pitch and the internal thread is ten pitch. Member 48 is fixed by clamping to shaft 2 and is calibrated by lines spaced at .050 intervals along its "length. By turning the micrometer sleeve 41 which is callthe locking plunger 5| upwardly, and then as the .opposite lug reaches shoulder 22 on segment l8, the locking plunger 5! snaps behind the other lug 20 and the slide, together with the driven head, is locked against movement in either direction. Thereupon, the driving head and annular flange 36 rotate, carrying eccentric which, being off center, causeslthe slide 21 to move in a transverse or diametric direction. BY

reason of alternate rotative and transverse movements of slide 21 the flat surfaces are alternately presented to the cutting or grinding brated by marking 100 equal divisions around its circumference and which are set to an index line marked axially on 48 to the left or counterclockwise the micrometer sleeve moves outwardly fifty calibrated 1000ths per revolution, at the same time forcingthe sliding nut 49 which is splined in member 48'which is clamped to shaft 2 in .such a manner that nut 49 is slidable inward-1y at the rate of one hundred 1000ths per revolution. But inasmuch as the micrometer sleeve is going outwardly at fifty 1000ths per revolution, sliding nut 49 only goes inwardly along the driving shaft 2 at the rate of fifty 1000ths per revolution. After the desired amount of adjustment has taken place the jamb nut 46 may be turned to the left to hold theadjustment. This looks the nut 49 and the micrometer sleeve 41 against theinner ends of the adjusting rods. 4! and 42 and these, bearing with their chamfered .outer ends against the angular head of the ecshown in Fig. 2, the slide lfiis locked by stop*22- against rotation in one direction and by the looking plunger 5l'against rotation in the opposite direction. Consequently, the idriven head can move in. neither direction, but the driving head together withtheeccentric can rotate and-cause the work carrying slide 21 to move transversely ordiametrically, by reason of the slide being held against rotative movement in the drivenrhead, but capable of sliding movement diametricallyby .reason of the roller bearing mountings 28: and; .=29'(Fig. 5)..

Consequently, as the driving shaft. continues torotate, the slide 2l.for one half turn of the driving shaft will travel diametrically or transversely, if the. eccentric 35 is adjusted-to a position off the center of the shaftl. Wheni the shaft. and driving head have rotated substantially 180?, dog 2| strikes the cam face 23 of cam 24, as shown in Fig. 3. This swings the outer end of the dog upwardly into contact withone of the lugs or bosses of slide l6 raising the lug:

20 out of contact (as shown in Fig. 2)" with shoulder 22 of the stationary housing andbringing the opposite lug 60 in position to -be encountered by the boss. [9 on the driving plate. 9

(see Fig. 3). Thedrlving head and the driven;-

head now rotate together for 180, whereupon one lug 20 (Fig. 2) engages the cam face 52 of cam 53 which is adjustable independently of cam '24 (see Fig. 6) and this causes the slide [8- to be raised releasing lug I8 from boss 60 and-forcing is oif'the center of shaft 2.

leasing. set screw 69;

The amount of throw or transverse movement of 1slide2'l is determined by how far eccentric 35 This adjustment is made by loosening jamb nut 46. Then, as already explained, micrometer sleeve 41 can be turned either to the right or left. This will advance or draw back the micrometer sleeve fifty 1000thsfor each turn and it will cause the slidingrnut 49-to go inz.the' opposite direction fifty 1000ths-foreachturn .of the sleeve. The consequence is, as one adjusting rod 4| moves in one direction, the other adjusting rod 42 moves an zequalpdistance in. the opposite direction, and the oifucapfli and then, after releasing set screw 68, turning with'a screw driver the screw 63. The screw 63 ,(Fig; 6) has an enlarged collar 54 which rotativelyimountsthe screw between the casing and the, casing cap 66. The screw 63 is threaded into-the cam slide 53. Likewisa'in the release of the slide Hi from the locked relation with the housing, the cam 24 may be adjusted in the same way by the similar screw 61 after re- These cams adjustable from. the outside of the chuck are a substantial improvement over the chuck described in the prior'Patent No. 1,687,143 which, in order to get a different timing, required the dismantling of the chuck j,and=the reworking or replacing of some'of the members inside the chuck as the cam rings are; neither adjustable nor accessible from the outside of the chuck;

I claim:

' 1. In a chuck or work holder for holding work for machining or. grinding non circulansha'pes,

the combination of a stationary housing, a drivingheadanda drivenheadmounted to rotate in said housing, a work holding slide arranged to and thentothe drivingh-eadand means for causing such alternate sliding. movements of said second slide to effect these purposes. v

2; In a chuck or work holder for holding work for machining. or grinding non-circular shapes,

the combination of a stationary housing, a driving head havin gfa projection .anda'driven head mounted-to rotate in said housing, a work holding slide arranged to travel back and forth diametricallyfandperiodically in said driven head, a secondgslide mounted inthe driven head and arranged rto travel hack and forth-diametrically-in saidlxhead to alternately lockthe driven head to the stationaryhousing andthento the driving headzandmeansfor causing such alternatemovemenisci-said second slide to effect these purposes-comprising a shoulder on the stationary housing cooperating with a part on the slide to hold the said second-slide and the driven head against.rotativemovement, a cam connected with thewstationary housing and a releasing dog carried on ithedriving head for contacting-the said cam and thenaportion of ,thesaid second slide to release thesame fromsaid shoulder and drive the same,-'slide into thegpath of the. projection onthe driving .memberto'key the driving and driven heads.- together.

BJInl-achuck or workholder for holding work fori'machining or grinding non-circularshapes, thecombination of a stationary housing, a drivingrhead-and'a driven head mounted to rotate in said housing, a work holding slide arranged to travel Y-back and forth diametrically and periodically in said driven head, a second slide mounted in the-driven head and arranged to travel back an forth diametrically in said head to alternatelylock the driven head to the stationary housing .and then to the driving head and means for/causing such alternate movements of said secondislideuto efiect these purposes including a shoulderonthe stationary housing arranged to contact the second slide to arrest the same and stop the driven member, a spring-pressed stop in ttheihousing'for snapping behind the second slide for preventing movement of the second slide and thedriven member in the opposite direction.

"4. In a chuck or work holder for holding work for machining or grinding non-circular shapes,

the combination of a stationary housing, a driving head. and a driven head mounted to rotate in said housing, awork holding slide arranged to travel back and =forth diametrically and periodically in said driven head, a second slide mounted in the driven head and arranged to travel back and forth diametrically in said head to alternately lock the driven head to the stationary housing and then to the driving head and means for causing such alternate movements of said second slide to effect these purposes including a shoulder on the stationary housing arranged to con tact the second slide to arrest the same and stop the driven member, a spring-pressed stop in the housing for snapping behind the said second slide for preventing movement of the second slide and the driven member in the opposite direction and a cam on the stationary housing arranged to cause transverse movement of the second slide while the same is also rotating to displace the spring-pressed stop temporarily while the stop later snaps behind the said second slide to prevent reverse rotation of the second slide and the driven member.

5. In a chuck or work holder for holding Work for machining or grinding non-circular shapes, the combination of a stationary housing, a driving head and a driven head mounted to rotate in said housing, a work holding slide arranged to travel back and forth diametrically and periodically in said driven head, a second slide mounted in the driven head and arranged to travel back and forth diametrically in said head to alternately lock the driven head to the stationary housing and then to the driving head and means for causing: such alternate movements. of said second slide to eifectthese purposes including a pairofadjustable-cams, one of which causes the secondv slide ;to m0vetransversely while it i is also rotating ndracspringwpressed stop that is temporarily. displaced bysaidsecond slide movement tosnap behind the secondslideand a shoulder on thestationary member which arrests the second slide and driven member at the same time the spring-.pressed-stop snaps behind the-second slide and-.amovablememberaon the driving head cooperating with theother adjustable cam to cause transverse movement of: the second slide to release the same fromwthersaid shoulder after an ap- P inted rotatiomofthe-drivinghead.

6. Ina chuck or work holder for holding work for machining air-grinding non-circular shap the combination 'of a stationary housing, a driving head mounted to rotate therein, a driven head-mountedto .rotatein said housing, a work holding slidearrangedto travel back, and forth diametrically and periodically .in said driven head, means arranged to alternately lock the drivenhead tozthe stationary housing and then to the driving head, means for causing said diametrical travel of "the slide comprising an eccentric adjustably relatedto the center of the driving head and means rpassing longitudinally through the driving head and movable longitudinally thereof to adjust the eccentricity of said eccentric,

'7. In a chuck orzwork holder for holding work formachining or :grinding non-circular shapes, the combination .of a stationary housing, a driving head mounted .to rotate-therein, a driven head z-mountedwto rotateiin saidhousing, a work hold n slide arranged .to:- travel back and forth diametrically and periodically in said driven head, .mea-ns arranged to alternately lock the driven ihead :to; the; stationary housing and then to the :driving headpmeans for causing said diametrical travel of the slide comprising an eccentricadjustably related to the center of the driving head, means passing longitudinally through the driving head and movable longitudinallysthereof to {adjust the eccentricity of said eccentric comprising a trackway diametrically of the driving head in which the eccentric can slide, an angular head on the rear of the eccentric, adjustable rods passing longitudinally through the driving head having their ends bearing against the conical head of the eccentric to slidably adjust the eccentric in said trackway and means for adjusting said rods.

8. In a chuck or work holder for holding work for machining or grinding non-circular shapes, the combination of a stationary housing, a driving head mounted to rotate therein, a driven head mounted to rotate in said housing, a work holding slide arranged to travel back and forth diametrically and periodically in said driven head, means arranged to alternately lock the driven head to the stationary housing and then to the driving head, means for causing said diametrical travel of the slide comprising an eccentric adjustably related to the center of the driving head, means passing longitudinally through the driving head and movable longitudinally thereof to adjust the eccentricity of said eccentric comprising a trackway diametrically of the driving head in which the eccentric can slide, an angular head on the rear of the eccentric, adjustable rods passing longitudinally through the driving head having their ends bearing against the conical head of the eccentric to slidably adjust the eccentric in said track- Way and means for adjusting said rods comprising a member having internal threads of a defined pitch, a slidable nut having external threads of half the pitch of the last-mentioned threads and a micrometer sleeve having complementary external threads engaging the internal threads of said member and complementary internal threads engaging the threads of the nut, the said micrometer sleeve and the nut arranged to abut the inner ends of the adjusting rods whereby when the micrometer sleeve travels in one direction the slidable nut travels in the pposite direction the same distance to give the proper travel to the eccentric head and eccentric.

9. In a chuck or work holder for holding work for machining or grinding non-circular shapes, the combination of a stationary housing, a driving head and a driven head mounted to rotate in said housing, a work holding slide arranged to travel back and forth diametrically and periodically in said driven head, a second slide mounted in the driven head and arranged to slide back and forth diametrically in said head to alternately lock the driven head to the stationary housing and then to the driving head and means for causing such alternate sliding movements of said second slide to' effect these purposes including cam means accessible for adjustment from the outside of the chuck.

10. In a chuck or work holder for holding Work for machining or grinding non-circular shapes, the combination of a stationary housing, a driving head and a driven head mounted to rotate in said housing, a work holding slide arranged to travel back and forth diametrically and periodically in said driven head, a second slide mounted in the driven head and arranged to slide back and forth diametrically in said head to alternately lock the driven head to the stationary housing and then to the driving head and means for causing such alternate sliding movements of said second slide to effect these purposes including a pair of cams slidable and adjustable from the outside of the chuck to alter the timing of the said locking actions.

8 11. In a chuck or work holder for holding work for machining or grinding non-circular shapes, the combination of a stationary housing;-

a driving head and a driven head mounted to rotate in said housing, a work holding slide ar-' ranged to travel back and forth diametrically andperiodically in said driven head, 'a'member mounted in the driven head and arranged to slide back and forth diametrically in'said head to alternately lock the driven head to the stationary housing and then to the driving head and means for causing such alternate sliding movements of said member to effect these purposes including cam means accessible for ad justment from the outside of the chuck. 12. In a chuck or work holder for holdin work for machining or grinding non-circular shapes, the combination of a stationary housing, a driving head mounted to rotate therein, a driven head mounted to rotate in said housing, a Work holding slide arranged to travel back and forth diametrically and periodically in said driven head, means arranged to alternately lock the driven head to the stationary housing and then to the driving head, means for causing said diametrical travel of the slide comprising an eccentric adjustably related to the center of the driving head and a member fixed to the rotatable driving head, a micrometer sleeve rotatable with respect to said member, the said member and the micrometer sleeve provided with cooperating devices for moving means passing longitudinally through the driving head foradjusting the eccentricity of the said eccentric.

BERNARD O. RICHARD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES'PATENTS Number 

